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Exporting C++ Functions for Use in C-Language Executables 

If you have functions in a DLL written in C++ that you want to access from a C-language module, you should declare these functions with C linkage instead of C++ linkage. Unless otherwise specified, the C++ compiler uses C++ type-safe naming (also known as name decoration) and C++ calling conventions, which can be difficult to call from C.

To specify C linkage, specify extern "C" for your function declarations. For example:

extern "C" __declspec( dllexport ) int MyFunc(long parm1);

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